question

rafael avatar image
rafael asked

SmartSolar 100/15 or 100/20

I have problem to choose which MPPT controller to buy. I plan to have four 380 W panels.

Panels have

(Voc/V): 40,4 V
(Isc/A): 12,0 A
(Vmp/V): 33,4 V
(Imp/A): 11,38 A


From the SmartSolar specification I see that I will be not able to have 4 panels on one SmartSolar Controller. Am I right? I need model with the load pins, thus 100/20 is the highest from SmartSolar series.

Can I oversize and have 4 panels in string? Can SmartSolar handle it? Or shell I have to buy two MPPT controllers whi make installation more complicated?

//Raff

MPPT SmartSolar
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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·

What battery voltage do you have?

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seb71 avatar image
seb71 answered ·

100/20 is not "the highest" from SmartSolar series. It is one of the smallest chargers.


What is the battery voltage?

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rafael avatar image
rafael answered ·

Yes, it is the highest from the series with the pins for output load. Am I wrong?

I want to start with one 12V 100Ah battery and adding more in future, With two such I can jump from 12 to 24 at the beginning.

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seb71 avatar image seb71 commented ·

I did not understood what you meant by "load pins".


1.5kW of solar array is oversized for any of those chargers (and for a 100Ah 12V battery).

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rafael avatar image rafael seb71 commented ·

There is no load connecters (load output) on higher models according document below:

https://www.victronenergy.com/upload/documents/Datasheet-BlueSolar-and-SmartSolar-charge-controller-overview-EN-.pdf

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seb71 avatar image seb71 rafael commented ·

Yeah, now I know what you meant by "load pins", as I wrote above.

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seb71 avatar image
seb71 answered ·

If you want to use a 100Ah 12V battery and the 100/20 charger, get just one of those 380W panels. Even one 380W panel is slightly big for the charger, but should be good for cloudy days.

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